Mark Hamill is deliciously creepy in new promo for the mid-season finale of The Flash

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Central City is preparing to celebrate Christmas, and the Weather Wizard has liberated Captain Cold and the Trickster from Iron Heights and formed a new company of rogues. Their goal? Kill the Flash (Grant Gustin).

The CW has released a new promo for the mid-season finale of The Flash -- which is titled “Running to Stand Still” -- in which Luke Skywalker Mark Hamill looks and sounds wonderfully creepy as the unhinged Trickster-dressed-as-Santa. Bad Santa.

Featuring the return of Spartacus star Liam McIntyre as the Weather Wizard, Mark Hamill as the Trickster and Wentworth Miller as Captain Cold, the upcoming episode will also feature the arrival of a new West family member: Wally West, played by Keiynan Lonsdale (Insurgent, The Divergent Series: Allegiant).